超越标准模型前沿交叉研讨会

Session

Session 9

23 Nov 2025, 09:00

Conveners

Session 9

• Yongcheng Wu (Nanjing Normal University)

18. Measuring Phase Transition Gravitational Waves and Higgs Self-couplings

Huaike Guo (University of Chinese Academy of Sciences)

23/11/2025, 09:00

I will discuss how to measure the gravitational wave spectrum from cosmological first order phase transitions, in particular the Electroweak phase transitions, and how to then predict observables which are important but difficult to measure by other experiments, like the Higgs self-couplings.

8. Relaxing BBN constraints on Heavy Neutral Leptons with Axion-like Particles

Chayan Majumdar (IMP, CAS)

23/11/2025, 09:25

Heavy neutral leptons (HNLs) are constrained by requirements of Big Bang Nucleosynthesis (BBN) as their decays significantly impact the formation of the primordial elements. We propose here a model where the primary decay channel for the HNLs is to an axion-like particle (ALP) and a neutrino. Consequently, HNLs can decay earlier and evade the BBN bound for lower masses, provided the ALPs...